<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: Margin with percentage determined by containing block</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
         <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#margin-properties" />
        <meta name="assert" content="Potential circular reference cannot cause the user agent to crash or hang." />
        <style type="text/css">
            #div1
            {
                float: left;
                border: 1px solid blue;
            }
            div div
            {
                margin: 50%;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the words "Filler Text" appear below.</p>
        <div id="div1">
            <div>Filler Text</div>
        </div>
    </body>
</html>